investigations of the epr parameters for the tetrahedral [fex4]- clusters in agx (x=cl, br)
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ID: 149179
2012
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Abstract
The EPR parameters g factors and the superhyperfine parameters for the tetrahedral [FeX4]- clusters in AgX (X=Cl, Br) are theoretically investigated from the perturbation formulas of these parameters for a 3d5 ion under tetrahedra by considering both the crystal-field and charge transfer contributions.The related model parameters are quantitatively determined from the cluster approach in a uniform way. The g-shift Δg (=g-gs, where gs≈2.0023 is the spin only value) from the charge transfer contribution is opposite (positive) in sign and much larger in magnitude as compared with that from the crystal-field one. The importance of the charge transfer contribution increases rapidly with increasing the covalency and the spin-orbit coupling coefficient of the ligand and thus exhibits the order of AgCl < AgBr. The unpaired spin densities of the halogen ns, npσ and npπ orbitals are quantitatively determined from the related molecular orbital coefficients based on the cluster approach.
| Reference Key |
zhang2012condensedinvestigations
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| Authors | ;Z.-H. Zhang;M.-Q. Kuang;S.-Y. Wu;B.-T. Song |
| Journal | conference on human factors in computing systems - proceedings |
| Year | 2012 |
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